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kbuild: Use ls(1) instead of stat(1) to obtain file size

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stat(1) is not standardized and different implementations have their own
(conflicting) flags for querying the size of a file.

ls(1) provides the same information (value of st.st_size) in the 5th
column, except when the file is a character or block device. This output
is standardized[0]. The -n option turns on -l, which writes lines
formatted like

  "%s %u %s %s %u %s %s\n", <file mode>, <number of links>,
      <owner name>, <group name>, <size>, <date and time>,
      <pathname>

but instead of writing the <owner name> and <group name>, it writes the
numeric owner and group IDs (this avoids /etc/passwd and /etc/group
lookups as well as potential field splitting issues).

The <size> field is specified as "the value that would be returned for
the file in the st_size field of struct stat".

To avoid duplicating logic in several locations in the tree, create
scripts/file-size.sh and update callers to use that instead of stat(1).

[0] http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ls.html#tag_20_73_10

Signed-off-by: Michael Forney <forney@google.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
This commit is contained in:
Michael Forney 2018-03-18 17:54:02 -07:00 committed by Masahiro Yamada
parent 3fdc7d3fe4
commit a670b0b4ae
5 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/boot/deflate_xip_data.sh
View File

@ -45,7 +45,7 @@ data_start=$(($__data_loc - $base_offset))
data_end=$(($_edata_loc - $base_offset))
# Make sure data occupies the last part of the file.
file_end=$(stat -c "%s" "$XIPIMAGE")
file_end=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" "$XIPIMAGE")
if [ "$file_end" != "$data_end" ]; then
printf "end of xipImage doesn't match with _edata_loc (%#x vs %#x)\n" \
$(($file_end + $base_offset)) $_edata_loc 2>&1

2
arch/powerpc/boot/wrapper
View File

@ -355,7 +355,7 @@ vmz="$tmpdir/`basename \"$kernel\"`.$ext"
# Calculate the vmlinux.strip size
${CROSS}objcopy $objflags "$kernel" "$vmz.$$"
strip_size=$(stat -c %s $vmz.$$)
strip_size=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" "$vmz.$$")
if [ -z "$cacheit" -o ! -f "$vmz$compression" -o "$vmz$compression" -ot "$kernel" ]; then
# recompress the image if we need to

2
scripts/Makefile.lib
View File

@ -329,7 +329,7 @@ dtc-tmp = $(subst $(comma),_,$(dot-target).dts.tmp)
size_append = printf $(shell \
dec_size=0; \
for F in $1; do \
fsize=$$(stat -c "%s" $$F); \
fsize=$$($(CONFIG_SHELL) $(srctree)/scripts/file-size.sh $$F); \
dec_size=$$(expr $$dec_size + $$fsize); \
done; \
printf "%08x\n" $$dec_size | \

4
scripts/file-size.sh Executable file
View File

@ -0,0 +1,4 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
set -- $(ls -dn "$1")
printf '%s\n' "$5"

4
scripts/link-vmlinux.sh
View File

@ -269,8 +269,8 @@ if [ -n "${CONFIG_KALLSYMS}" ]; then
kallsyms .tmp_vmlinux2 .tmp_kallsyms2.o
# step 3
size1=$(stat -c "%s" .tmp_kallsyms1.o)
size2=$(stat -c "%s" .tmp_kallsyms2.o)
size1=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms1.o)
size2=$(${CONFIG_SHELL} "${srctree}/scripts/file-size.sh" .tmp_kallsyms2.o)
if [ $size1 -ne $size2 ] || [ -n "${KALLSYMS_EXTRA_PASS}" ]; then
kallsymso=.tmp_kallsyms3.o